ACTIVITIES ON TIME AND FREQUENCY AT SHANGHAI OBSERVATORY

Zhai Zaocheng, Zhuang Qixiang, Hu Jinlin, Kiu Wunwei

Abstract:	The activities on time and frequency during recent two years at Shanghai Observer tory are summarized as follows: 1. Atomic Frequency Standards. Several improvements to the H-masers and the primary laboratory's Cs standard were introduced at the Shanghai Observatory. A transportable hydrogen maser has been recently developed. 2. Atomic Time Scale. The recent progress in Shanghai Observatory's atomic time scale AT(SO) is described. The formation of the Chinese Joint Atomic Time (TAJ) is also presented. 3. Satellite T/F transfer. Recent developments in time synchronization via GMS ranging signal are discussed. 4. Time Service and T/F Applications. 5. Future Plans for Time and Frequency. Shanghai Observatory is one of two observatories which are responsible for determining the national standard of frequency and for keeping Chinese standard time based on the Coordinated Universal Time (UTC) which is disseminated by BPM, BPL and XSG transmissions. To carry out these objectives, studies have been made on atomic frequency standards, atomic time scales, time transfer methods, including satellite techniques and other T/F measurement systems and so on.
Published in:	Proceedings of the 18th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 1986 DuPont Plaza Hotel Washington, DC
Pages:	155 - 163
Cite this article:	Zaocheng, Zhai, Qixiang, Zhuang, Jinlin, Hu, Wunwei, Kiu, "ACTIVITIES ON TIME AND FREQUENCY AT SHANGHAI OBSERVATORY," Proceedings of the 18th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, DC, December 1986, pp. 155-163.
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